our technology for detecting explosives and follow-up investigations, vastly better. these sorts of attacks, as tragic as it was. 3 people killed, over 100 wounded, there's still of a relatively small scale. again, it's not surprising to me that you could have an attack like this and not see information either from the fbi or overseas, that was international terrorism, indicating there might be some threat, either generally or pointed at boston. the level of professionalism and understanding of how now to investigate this and the level of coordination, is markedly better. that will move the investigation forward at a rate we never would have seen in 1995, or with timothy mcveigh or going forward in 2011. >> it wasn't just the boston marathon. it was patriots' day. do you think that the date might play in the investigation? >> the date, april 15th, tax day, patriots day, the marathon, please be individual dots that investigators will think about. they will be careful to, the media, i include myself in that, now, we want to connect those dots very quickly and say, look.